Rotary jar



June 5, 19285 J. A. KAMMERDINER ROTARY JAR INVENTOR. Jam"; ,4.fimmfi/"mkier Filed Nov.29, 1926 A TTORNEYS.

Patented June 5, 1928.

UNITED STAT S JAMES A. KAIMERDINER, LOS ANG -ELES, CALIFORNIA.

Ronni JAR.

Application and November 29, me. Serial in. 151,325.

This invention relates to a rotary jar for use in well drillingapparatus, and more particularly to a jar which may be placed in astring of drill pipe, to remain there during the drillin operations. Itis thus available for imme iate use when the need arises. This is ofvery great value, as it is well known those skilledin the art that if,

.and the lost tool has had a chance to. become more firmly lodged in thehole, increasing the difiiculty of its removal. It is accordingly anobject of this invention to provide a rotary jar which ma be used in astring of drill pipe during dri ling operations. i A further object isto provide a jar which may be readily manufactured. Tools of this typeas heretofore constructed have been sub ect to rapid wear and it is astill furthlerobject of this invention to provide a jar of increaseddurability and Wearing qualities. i

f hese objects together with other objects and correspondingaccomplishments are obtained by means ofthe embodiment of .my inventionillustrated in the accompanying drawingin which:

Fig. 1 IS an axial section through a jar 85 in its normal, 'or set,position; Fig. 2 is a clear space between the thread sections 11 for thethread sections 19'to 'versa. Also the keys 12 an similar sectionthrough a portion of the vshell only; Fig. 3 is a section correspondingto Fig. 1 and taken at right angles to it, the lower portion beingbroken away; and Figs. 4 and 5 are sections as seen onthecorrespondingly numbered lines of Fig. 1 looking in'the'directionindicated by the arrows.

' Referring more particularl to the draw- J ing, a cylindrical body'orshe I 6 is provided witha tapered, threaded pin 7 at its upper end andhaving a bore 8 extending through it; The diameter of the upper portionof the bore is reduced to form a plunger chamw ber 9 and is stillfurther reduced where it passes through the pin. The body is internallythreaded at its lower end and mounted therein is .a closure member 10,.

'iforming an anvil. Within the. bore is a mutilated thread 11, formed oftwo diametl 'rically opposed portions, each occupying aproximately onequarter of the periphery.

elowthese threads are two keys or abutments 12, also diametricallyopposite each other and extending from one edge of the thread to thecenter, thus occu ying approximately one eigth of the perip ery each,and leaving three-eigths 'of it unoccupied between them.

Disposed within the shell is a hammer comprising a cylindrical head '15adapted to engage the anvil 9 and a tubular mandrel 16 extendingslidably through the bore in the anvil. The lower portion of the mandrelterminates in a tapered threaded pin 17 to which any suitable tool maybe attached, in this case a bit or under reamer. The \mandrel 16, abovethe hammer 15 is provided with two diametrically opposite keys orabutments 18 each occupying approximately one-eigth of the peri hery ofthe mandrel and leaving three-eigt s clear between them.

Above these again are mutilated threads 19, diametrically opposite andoccupying approximately one-quarter of the periphery, for engagementwith the corresponding threads in the shell. Above threads 19 are bosses20, of such learigth and position that they will keep thre s 19 from eagin threads 11 until the tool is entirely co apse and the full numberof threads can engage each other. The upper portion of mandrel 16 isreduced in diameter toform, a plunger 21, rovided with packing 22, which'works incamber9.

It will be noted that there is sufiicient ass and" vice 18 form a.spline and are'so proportioned as to permit only a quarter turn of theshell relative to the mandrel; in one extremity of this movement, thethreaded sections are fully engaged, while at the other they are freeand vertical movement of the shell relative to themandrel can occur.However, the spline. acts to limit rotary movement at all portions ofthe mandrel.

The hammer member is provided with a bore 23, extending -therethrough,so that circulation may be maintained from the drill pipe above, throughthe jar and on thron h.

the .tool or pipe attached to pin 17. e

packing 22 forms a tight seal between plunger 21 and plunger chamber 9,whatever the position of the hammer, and prevents 110 loss ofcirculation into the cage and thence between members 10 and 16 into thehole. Mounted in closure member 10 and secured thereto by a set screw 2%is one end of a compression spring 25 which encircles the lower portionof mandrel .ldythe other and rests in a recess in the collar above pinThis spring must be wound to correspond with the mutilated threads lland 19, that is, the threads are left hand, the spring must be woundleft hand and vice versa.

The jar is placed in a string of drill pipe, the drilling tools at thelower end, and these then set onthe bottom. The weight oil ripe abovejar will cause it to telescope compress spring 515, tends to and causerotation oil the cage and mandrel relative to each other. This isprevented however by lug lid, until the threads fully engaged, and thejar is fully telesooped. When this occurs, cage 6, being supported bythe drill pipe which is tree to turn, will be turned one quarter oil arevolution .by spring 25 acting against the mandrel, which is heldstationary by the drilling tools on bottom. This will bring the threadsinto full engagement as clearly shown in 4 oil the drawing and lugs and18 together, as shown in Fig, 5. Further movement is obviously preventedby these lugs, The tool is new set; the drill is picked upofi bottom anddrilling procoeds, the twist of? the drill pipe being transmitted fromshell 6 by lugs l2 and 18 which comprises a rotarv coupling to mandrell6 the drill. It IS evident that these lugs may be of any length toobtain the required strengnh. Should the drill become stuck, the drillpipe is lifted and a pull exerted on the tools, which may be suihcientin itself to free them i not, the tension in the drill Icipe causedthereby will stretch it, as a long string oil such pipe has considerableelasticity. 'When suficient tension has been attained, the pipe is givena reverse quarter turn, which causes the thread sections 11 to slip outof engagement with thread sections 19 into the clear space between them,permitting the shell to ride u on the harm mer member until the anvilstrikes the hammer head. This will give a heavy blow in an upwarddirection to the drilling tools and probably free them. If the firstblow fails, as many blows as desired may be struck, by repeating theoperations of setting the jar and stretching the pipe just described.When free the tools may be re moved from the hole, or the jar reset anddrilling proceeded with as desired.

The jar can be used for a plain fishing job, in a similar manner, inwhich case it 18 run in the hole with suitable fishing tools attached toits lower end. When a hold is secured on the. fish, the jar is set andblows delivered as before described.

nearest What I claim is:

l. A rotary jar for use in well drilling comprising a rotary hammermember and a rotary anvil member telescopically connected, each of themembers having trig shoulders, said shoulders being interrupts to permitthe passage in an axial direction of the shoulders on the hammer memberpast the shoulders on the anvil member whereby when said shoulders arein engagement further longitudinal movement of the members is prevented,but when out of engagement longitudinal movement of said members ispermitted, and spline means for said members permitting a limited rotarymovement for engagement and disengage merit of said shoulders.

2. A rotary for use well drilling comprising a rotary hammer member arotary anvil member telescopically connected, each of the members havingtrip shoulders, said shoulders being interrupted to permit the passageof the shoulders on the hammer memberp'ast the shoulders on, the anvilmember whereby when said shoulders are in engagement furtherlongitudinal movement of the members is prevented, but when out ofengagement longitudinal movement of said members is permitted, and aspline rotary coupling for said member permitting a limited rotarymovement for engagement and disengagement of said shoulders.

3. A rotary jar for, use in well drilling comprising a rotary hammermember and a rotary anvil member telescopically connected, each of themembers having trip shoulders,

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Bill

said shoulders being interrupted to permit the passage in an axialdirection or the shoulders on the hammer member past the shoulders onthe anvil member whereby when said shoulders are in engagement furtherlongitudinal movement of the members is prevented, but when out ofengagement longitudinal movement of said members is permitted, andspline means independent of said shoulders for transmitting rotarymotion from one member to the other at all axial positions of saidmembers and permitting a limited rotary movement for engage ment anddisengagement or said shoulders. 4. A rotary jar for use in well drillincomprising a rotary hammer member and a rotary anvil membertelescopically connected, each of the members having trip shouldei's,said shoulders being interrupted to permil: the passage'in an axialdirection of the shoulders on the hammer member ast the shoulders on theanvil member where y when said shoulders are in engagement furtherlongitudinal movement of the members is prevented, but when out of engaement longitudinal movement of said mem ore is permitted, means operatedby closure movement of said members to turn said shoulders lld intooperative on merit, and s line means independent of shoulders t d limitthe rotary movement between said members at all axial positions of saidmembers and permit engagement and disengagement of said shoulders.

5. A rotaryjar for use in well drillin comprising a rotary hammer memberan a rotary anvil member telesco ically connected, each of the membershaving trip shoulders, said shoulders being interrupted to permit thepassa e in an axial direction of the shoulders on t e hammer memberpastthe shoulders on the anvil member whereby when said shoulders are inengagement further longitudinal movement of the members is prevented,but when out of engagement longitudinal movement of said members ispermitted, and spline means independent of said shoulders to limitmovement between said members at all longitudinal positions engageableat all axial ositions of said members and permitting a imited rotarymovement for engagement and disengagement of said shoulders.

6. A rotary jar for use in well drilling comprising a rotary hammermember and a rotary anvll member telescopically connected, each of themembershaving tri shoulders, said shoulders bein interruptes to permitthe-passage of the s oulders on the hammer member past the shoulders onthe anvil member whereby when said shoulders are in engagement furtherlongitudinal movement of the members is prevented, but when out ofengagement longitudinal movement of said members is permitted, and meansindependent of said shoulders to limit the rotary movement between saidmembers located longitudinally beyond said shoulders and operab e at allaxial positions of said members.

7. A rotary jar for use in well drilling comprising a rotary hammermember and a rotary anvil member telescopically connected each of themembers having correspondi 'ly mutilated threads forming trip shoul ersto permit the longitudinal passage of the shoulders in the hammer memberpast theshoulders on the anvil member when in one angular position andto prevent lon 'tudinal movement of the members when the s oulders arein engagement, and spline means for said members permitting a limitedrotary movement for en agement and disengagement of said shou ders.

8. A. rotary jar for use in well drilling, comprising a rotary hammermember and a rotary anvil member telescopically connected, each of themembers having correspondingly mutilated threads forming trip shouldersto ermit thelongitudinal passage of the shoul ers when in one angularPOSI- tion and to prevent lon 'tudinal movement of the members when t eshoulders are in engagement, and abutments longitudinally spaced fromsaid shoulders on said anvll members and on said hammer member toprovide a spline permittin engagement and disen agement of said soulders but engagea le at all axial positions of said memers so as tolimit rotary movement of said members.

In witness that I claim the fore oin I have hereunto subscribed my namet is 1 th day of November, 1926.

JAMES A. KAMMERDINER.

